Cooling system for internal-combustion engines



April 10, -19225.

C. F. KETTERING COOLING SYSTEM FOR INTERNAL COMBUSTION ENGINES 2 Sheets-Sheet 1,

Filed April 2, 1925 April 10, 1928. 1,665,307

c. F. KETTERING coomne SYSTEM FOR INTERNAL COMBUSTION ENGINES Filed April 2, 1923 2 Sheets-Sheet 2 125712255 E5 JJJUEFZDF ZYHPHE "Further objects and ;'-ent invention is clearly' s hown x I open at one end 'at to communicate with K toward'the fan inlet ma -0 be discharged v g with, 'the'damper'ports 3 l'are opened to Patented Apn 10, 1928.

UNIT en} mi ES QF wE-,

4 CHARLES E. KETTERING, or .nAYronf 01:10, v'As srenoia' 7T0 GENERAL noronsnn:

SEARCH CORPORATION, OF DAYTON,

OHIO, A. CORPORATION OF DELAWARE.

ooo i No sysrninlr'on mun -ce eteries Q This invention relates to apparatus for controlling an "air-cooled internal combustion engine. 7 '7 i' i It is among the objects of the presentin- 5 vention to regulate the temperature of the air surrounding the engine in accordance with engine operating conditions and more particularly in accordance with the power developed bythe engine," i p "advantages of the present invention will be apparent from the following description, reference being had to-the accompanying drawings, wherein a pr'ferred form of embodiment of the pres- In the'fdrawings:

v Fig. 1 is a sideelevation of an'air-cooled i engln showing acontrol of the coohnga r Q in; accordance withpthrottle opening.

Fig; 2 is a fragmentary View similar to showing the'control of coolingairin j'accordancefwithengine"intake suction;

i 1"; .ljigQB 'isa detailf view of'the damper for 5the engine. I i 7 7 jfEig. 4L isa sectional view on an enlarged scale taken'on line Hot Fig. 3.

In the drawings,jan"in ternal combustion eentmning the admission ofc'ooling air to Tengine 20 "includes' plurality of cylinders 2L each provided withlongitudinally lextending finsQ QQfThe'means for'causing the cooling air" t'ofcirculatey. about the engine comprises a draft tube including a skirtrportion" 23 surrounding the; engine" cylinder fins and communicating withaghoo'd portion 24;

ithe inlet of afan 2 6 includingfa plurality mutt-1 f damper portsf34 each controlled by-the vane of the damper valve 35 which is pivoted at'36. The'dampervalve 35 is con:

v a1vles'35 are each provided {Witha'fstud 37 onlwhich is pivotally mounted a collar 38 LWhic'h isapertured to receive anoperating rod 39 attached thereto by means of a cotter I p n 40. qAs, shownin Fig. the'rod '39is i provided with a series of-holes 41 jadj acent the attachment ofthe "rod to the collar 38. i l

' Eachi hole Al is adapted to receive the pin "Se "that fa rodjmay be attached to' the dampery'alve 85 invariousjpositions of adjustment]. Y Y I The form of the invention shown in Fig.

1 includescommon'means' for controlling the circulation-pf cooling'airj and also for 'controlling the throttle. The engine '20 is pro- "vided with a carburetor attached to the engineint'ake 51.' fAnfengine starter 52 is"- supported onethe engine crank case and pro 'vides the convenient support for a shaft-53 V-attachedtoan accelerator pedal o l and to a "lever. 55 connected .by' a link56 with-the operating rod 39.' qThe lever '55 is connected by link, 57 with a lever 58 jattached to the fuel tothe engine intake. The operation of this tion is asfollows: I v c When the engine isat rest shown in 'Fig. 1 to permit the admission of "off an blades 27arrangedfto; throw thelaifia small amount"of'cooling air to. the enl" outwardly from the fan; The fan is'*n 1ount-' 4D by nieansof a belt' 29' connected with fan fupthroughthe :tanlbla des 27.

j" I Themeans for controlling the clrculat on 1 of cooling air through the'drait tube'me'm here 23" and 24 comprises a draft tube skirt 50 extension 3211 which f extends downwardly I (from th dr t e Sk r 23 andi's shown: a resting uponthe top ofthe engine frame "extension is provided- With a pluginel. In order toincrease [the power de-' veloped by the engine, whether the power i11- creasebe caused by increase of speed or in-- crease in engine: to'rque',:th'e throttle 59 must rotation of the fan will cause air'to bedrawn be opened, This is accomplished by pressing downs on'the accelerator pedal 54: to

"'throttle;59for controllingthe passage of form ofthe inirerig or idlingi 'the .v damper ports, 34 will'bei partly openas open the throttle; Simultaneouslyitherecause more circulating airtopass arou'ndthe the engine-is developingjgreater powen is used to r turn the pedal 54; to normal position whenjf got pressure i j released.

1A return spring 60 .ofjany*desiraloletype;v I

cylinder in order that the temperature oftheengine cylinders may not be excessive when, i

7 Therefore as the throttle is closed-the damplati'on of air about theengine isshown in Fig. 2; This apparatus comprises means "of the engine wh er valves 35 will bereturned simultaneously to closed position in order to reduce the amount of air circulating about'the cylinders in order to prevent excessive cooling n the engine is developing' l-cs s power. g 1 a Another, manner of controlling the circufor controlling the circulation of air inac- 7 cordance with engine suction and comprises ';a cylinder 70 attached by suction pipe :71 to I a: the engine intake 51, theend of the pipe .be-

ing curved ant/72 in a direction opposite to the direction of rflo-w 'of i'uel toward the engine "cylinders as indicated byv the arrow 73. A piston 74 is :slidablewithin the cyhn jder 70 andisconnected by link"? 5 Withthe lzdamper, operating-rod 3'9. A spring iid norholds the a ,piston 1 7 1 in thei position shown in Fig. 2.5 Whenthe engine is started u and is idling, the throttle 59 will be partopen thereforefthe suction in the engine intake '51 will berelatively great and will overcome th-e spring fifi and causef'the pis- I ten 7, 4: to be moved to the leftthereby caus Whenit isl desired, to increase v therspeed of i-ng thedamper valves 35 to "moveto part-r lyclosed position as shown iniFlegnl 'thgis ;;posi;t-ion being known as the idlingposition.

l -the' engine or to causeto carry more load we s m pe r-t ethr ttie15 fopen ,thereby, causing the -engine intake suction togdecrease, thus allowingithe ringm to e t d mper 3 -"t welfdr i n P s mor ejor less in accordance with the drop in suction" in the intake '51.; Assuming vthat gengi-ne power increase is .due primarily Vito i head atthe entrance" to pipel7l thereby tendincrease in I speed, itjijs; obvious that there is v a tendencygfor-engine intake suction toin crease although the throttle-opening Inayi'o-v [main 'the same. 'This increase in suction would tend tQ csQ' the dampers. fThis 'te ndencyto increase'the suctionlinthe suction rection of arrow Z3Hwill produce a velocity i'ngito counterbalance an increase in suction head; Thereforegthe suction in the cylinder will" tend togdecrease as the engine ,power -increases whether the gengine increase :of

a power-isldue to: increase of speed or increase :1n--;1oa d. In this manner the amount ofgair, ClIOlllfittlng about the cyl nders (is permitted 7 {to increase automatically; asthe engine power; inoreases so {that the -heating of -thetengine 1 m ay' -not be .encessive.

" tu-le the form of embodiment of -the" ,ginyentionas heizein disclosed, constitutes a gprefcrregl form,. it is ltofibe understood that other 1 forms might be adopted, all coming cooperatingwith said portsand adapted to cylinder; a suction pipe leading from said cylinder and peninginto the en ine intake conduit; a piston operating in 'saidfcy'linder, and operatively;connected wit'lrall of said ]dampers,;"and a spring acting to hold said dampers in jnorinally closed positions;

one port and one damper being associated with each engine cylinder, to" thereby Coir trol several separate Streams of air flowing through said ports andinto'said casing a'do j acent the several'cylindersof'theengine, V

2. Ina multiple-cylinderfa'ir cooled [inter-c I .nal combustion flengiiiei and in combination vwith the cyllnders thereoifla casmg cuties ingsaid cylinders, a. ital-1 for producing afi'ow of air past said cylindersg ajplurality.

or dampers cooperating with ports fpro vided insaid' casing and adapted to control the'fflow oi a r there'lntoi; iacy1'inder; a suctionpipej leading from said cylinder into the intak curved in .said;con fun? and opens. in -a7 Climb- ,tionlopposite toTthaif off-the flow of coinbuse tlble m purenierethrough; a pislton'oper- 1 0 Y ating within said cylinder, and which piston is operatively connected with said dampers; and a spring acting "to hold said campers in normallyclosed1positionsa 1 r a -3. In a multile-oylinder air cooled .inter- 5 anal combustion engine 'alncflr'jin combination.

fvith'the cylinders thereofpa "casing enclos 7 mg sa1dcy 11nders, fand a' fan for-producing Lflow 'of air gp ast cylinders, a plurality or separatef 'and independent ports leading into said casing; a plurality-a1?"p'ivoran 1 Y upported voscillating' dampers "cooperating with said ports g and adapted to. control the l V flow Or ana inseam casing; plurality of 1 damper operating collars arranged 1o'1'1e upbn "1 5 each oi sald studs and which collars have openings to receiveanv operating rodgfan operating rod extendingthrough and said openings and 'cotterpinsextending through V l.'egiste ring'iholes foffsaid icolla'rs' and in said 7 12 operatl-ngrod.

ternal combustion engineandfincombination 1 .wlth a plurality of vertically,arranged cyline I ders a-casing enciIOS'i said cylinders, and whichcasing ,inciudesjafhood fportijonat its .upper end extending along \the heads off said cyl nders; :a fan, for producin -11a Tfiow'yof air upward andpastsaidcylindersand along i said hood; apluralityfofif separate andin -1 dependent ports leading into the lower end cylinder, to thereby control the several senaof said casing; aplurality of dampers c0- rate streams of air flowing through said operating With said ports and adapted to ports and into said casing adjacent the lower 10 "control the flow of air into said casing; and ends of the cylindersof the engine.

6 a single operating member eonneeted with In testimony whereofIhereto afiix my'sigall 01": said dampers; one port and one nature;

a damper being associated with each engine 7 CHARLES F. KETTERING. 

